The Lounge refers to a group of technologically advanced Naga who patrol the skies between the Frozen Sea and Val Roa. The group that first encountered the Noble Jury was led by Razzar. They are highly armed and trained, and apparently engaged in a mercenary mission to eliminate Changelings when they are introduced in Urohringr.
The Naga are originally from the islands to the south of Val Roa. It appears that the Lounge represent only a small minority of the Naga population, and the majority of them are peaceful traders.